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Enhanced light extraction efficiency of micro-ring array AlGaN deep ultraviolet light-emitting diodes

2017; Institute of Physics; Volume: 56; Issue: 9 Linguagem: Inglês

10.7567/jjap.56.092101

1347-4065

Gabisa Bekele Fayisa, Jong Won Lee, Jungsub Kim, Yong‐Il Kim, Youngsoo Park, Jong Kyu Kim,

ZnO doping and properties

An effective approach to overcome inherently poor light extraction efficiency of AlGaN-based deep ultraviolet (DUV) light-emitting diodes (LEDs) is presented. We demonstrated the 5 × 5 array micro-ring DUV LED having an inclined sidewall at the outer perimeter and a p-GaN-removed inner circle of the micro-ring, together with MgF2/Al omnidirectional reflectors. The micro-ring array DUV LED shows remarkably higher light output power by 70% than the reference, consistent with the calculated result, as well as comparable turn-on and operational voltages, which are attributed to the effective extraction of strong transverse-magnetic polarized anisotropic emission and the reduction of the absorption loss by the p-GaN contact layer, simultaneously.